3 research outputs found
Quantification of Lung Abnormalities in Cystic Fibrosis using Deep Networks
Cystic fibrosis is a genetic disease which may appear in early life with
structural abnormalities in lung tissues. We propose to detect these
abnormalities using a texture classification approach. Our method is a cascade
of two convolutional neural networks. The first network detects the presence of
abnormal tissues. The second network identifies the type of the structural
abnormalities: bronchiectasis, atelectasis or mucus plugging.We also propose a
network computing pixel-wise heatmaps of abnormality presence learning only
from the patch-wise annotations. Our database consists of CT scans of 194
subjects. We use 154 subjects to train our algorithms and the 40 remaining ones
as a test set. We compare our method with random forest and a single neural
network approach. The first network reaches an accuracy of 0,94 for disease
detection, 0,18 higher than the random forest classifier and 0,37 higher than
the single neural network. Our cascade approach yields a final class-averaged
F1-score of 0,33, outperforming the baseline method and the single network by
0,10 and 0,12.Comment: SPIE - Medical Imaging 2018: Image Processin
Spectral Data Augmentation Techniques to quantify Lung Pathology from CT-images
Data augmentation is of paramount importance in biomedical image processing
tasks, characterized by inadequate amounts of labelled data, to best use all of
the data that is present. In-use techniques range from intensity
transformations and elastic deformations, to linearly combining existing data
points to make new ones. In this work, we propose the use of spectral
techniques for data augmentation, using the discrete cosine and wavelet
transforms. We empirically evaluate our approaches on a CT texture analysis
task to detect abnormal lung-tissue in patients with cystic fibrosis. Empirical
experiments show that the proposed spectral methods perform favourably as
compared to the existing methods. When used in combination with existing
methods, our proposed approach can increase the relative minor class
segmentation performance by 44.1% over a simple replication baseline.Comment: 5 pages including references, accepted as Oral presentation at IEEE
ISBI 202
Imaging and Treatment of Bronchiectasis:Chest computed tomography to diagnose bronchiectasis and to optimise inhalation treatment
This thesis covers image analysis of bronchiectasis and treatment with inhalation antibiotics